Only one of the following statements is true of the exponent
     Only one of the following statements is true of the exponential function f(x) = e^x.  a. y rightarrow 0 as x rightarrow -infinity and y rightarrow infinity as x rightarrow infinity  b. y rightarrow infinity as x rightarrow -infinity and y rightarrow 0 as x rightarrow infinity  c. y rightarrow infinity as x rightarrow -infinity and y rightarrow infinity as x rightarrow infinity  d. y rightarrow 0 as x infinity and rightarrow -infinity as x rightarrow -infinity  e. rightarrow 0 as x rightarrow -infinity and y rightarrow -infinity as x rightarrow infinity 
  
  Solution
y=ex
To check the end behaviour of this function,the best option is to graph the equation.
And from the graph,we can say that as x->- infinity,y->0 and as x-> infinity,y -> infinity
Therefore the correct option is a

